Chewy get it in writing from the council that you have first refusal at market value to buy the land when it comes on the market.I was told by the property services department that i would be able to buy the old units i was in ,when they were put on the market they were sold by tender for a stupidly high price .

The land won't end up for sale as such. If after four years I am still renting it I can approach the council and ask if they would like to sell it. It seems pretty normal round here that if you rent something off the council for long enough they offer it to you to buy, if you don't buy it you carry on renting as before.